True story: I had been looking at Mazda's twin-turbocharged RX-7. I already had a fire-breathing sports-car. I didn't really need this thing. But I really liked it.
I've been into R/C model airplanes my entire life and have always had a particular attraction to high-end, high-performance gliders.
One fine Sunday afternoon I was coming back from a flying session and decided to stop by the dealership to check out the RX-7 one more time. The sales guy pressured as they usually do. For some reason I put a stupid challenge on the table. I said: "I have a 2.5 meter glider wing in my car right now. If it fits into the twin-turbo RX-7, I'll buy it."
I drove the RX-7 home that day.
edit: Instead of replying to d23. There are a lot of things which I buy out of impulse, like "that would be cool to have". But if I have to go to excessive lengths just to buy the thing, I don't.
Our propensity to buy peaks at a certain value - say 10 points for me in this instance.
Every time an obstacle is placed in the way that propensity gets reduced by a value related to the frustration level. As the points reduce our propensity to buy becomes irrelevant in the face of the many other things going on.
They had already for me lost points for 1: not making it clear that the printer only uses PLA and not ABS (-3), 2: the fact that it doesn't accept ABS (-2) and 3: because only one color of PLA is available at the moment (-2). The unnecessary registration was enough to halt the process. (-6)
Note how relatively large the usability scores are versus the functionality scores. Being easy to deal with is absolutely paramount in commerce.
That's an unfortunate filter to have in place.
A 3D printer has been on my radar for a while, and I saw this as the first design that's refined and cheap enough for my purposes.
I do tend to make quick decisions, and $2200 is within my range at the moment.
Impulse buys, almost by definition, can always be deterred by minor distractions. Cost, and other seemingly important factors don't really matter.
The apple store exists in part because people make large purchases on a whim, same for car dealerships, etc.